Cadillac CT4 vs. Cadillac ATS: Exterior, Interior, Cargo Dimensions

The Cadillac CT4 is the luxury automaker’s new C-segment sedan that will take on rivals like the BMW 1 Series, the Audi A3, and Mercedes-Benz A-Class, marking the very first time that Cadillac had an entry into the C-segment to take on the aforementioned rivals.

The CT4 draws its roots back to the now-discontinued Cadillac ATS Sedan, which it indirectly replaces. In fact, the CT4 uses the ATS’ general foundation, while significantly changing or outright redesigning the exterior, interior, and mechanical bits. But those with keen eyes will be able to recognize the ATS in the roofline, door shapes and several other hard point areas. So, we thought it appropriate to take a closer look at the CT4 and compare it to the ATS with regard to exterior dimensions, interior dimensions, and cargo dimensions.

Cadillac CT4

Cadillac ATS

Exterior Dimensions

Outside, we find the CT4 is larger than the Cadillac ATS in almost every single way.

Although both models have an identical wheelbase, the CT4 is substantially longer in terms of overall length, adding an extra 4.4 inches over the ATS. The CT4 is also 0.4 inches wider overall and 0.1 inches taller, while both the front and rear tracks are 0.8 inches wider.

To note, the overall width measurement listed here does not take into account the width of the sideview mirrors.

Cadillac CT4 vs. Cadillac ATS - Exterior Dimensions
Dimension	Cadillac CT4	Cadillac ATS	+/- Cadillac CT4
Wheelbase (in.)	109.3	109.3	0
Overall Length (in.)	187.2	182.8	4.4
Overall Width (in.)	71.5	71.1	0.4
Overall Height (in.)	56	55.9	0.1
Front Track (in.)	60.3	59.5	0.8
Rear Track (in.)	61.7	60.9	0.8

Cadillac CT4-V interior

Cadillac ATS-V interior

Interior Dimensions

The CT4 does improve on the ATS Sedan when it comes to interior dimensions.

Compared to the ATS, the CT4 offers 0.3 inches less front and rear headroom, and 0.1 inches less front and rear legroom. Meanwhile, first and second row shoulder room and first row hip room are identical compared to the ATS. That said, the CT4 does manage to offer more second row hip room compared to the ATS, with an extra 0.2 inches.

The fact that the CT4 does not improve on the ATS Sedan in the interior dimensions area isn’t something that we consider a demerit. That’s because the CT4 is a C-segment car, and has sufficient space for that segment. Meanwhile, the ATS was positioned as a D-segment car. In that regard, it had less room than its direct rivals.

Cadillac CT4 vs. Cadillac ATS - Interior Dimensions
Dimension	Cadillac CT4	Cadillac ATS	+/- Cadillac CT4
First Row Headroom (in.)	38.3	38.6	-0.3
First Row Legroom (in.)	42.4	42.5	-0.1
First Row Shoulder Room (in.)	55.2	55.2	0
First Row Hip Room (in.)	53	53	0
Second Row Headroom (in.)	36.5	36.8	-0.3
Second Row Legroom (in.)	33.4	33.5	-0.1
Second Row Shoulder Room (in.)	53.9	53.9	0
Second Row Hip Room (in.)	52.5	52.3	0.2

Cadillac CT4-V

Cadillac ATS

Cargo Dimensions

Interestingly, the CT4 features more cargo room than the ATS, with 10.7 cubic feet total. That’s 0.3 cubic feet more than the 10.4 cubic feet offered by the Cadillac ATS Sedan.

Cadillac CT4 vs. Cadillac ATS - Cargo Dimensions
Dimension	Cadillac CT4	Cadillac ATS	+/- Cadillac CT4
Cargo Volume (cu. ft.)	10.7	10.4	0.3

The Cadillac CT4 broke cover in May of 2019, first as the performance-oriented CT4-V, and later as the “standard” CT4 luxury sedan. It will go on sale in the first half of the 2020 calendar year in the United States, followed by other markets. To note, the CT4 goes on sale in China during the first quarter of 2020.

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